Represents a row which can be expanded to reveal nested data.
public interface IExpanderRow<TModel> : IRow<TModel>, IRow, IExpander, INotifyPropertyChanged
kind:method, kind:property, kind:ctor. Press Esc to clear.UpdateShowExpander(IExpanderCell, Boolean)Called by an IExpanderCell when it receives a notification that the row's ShowExpander state should be changed.